Marissa King, professor at Yale School of Management, has studied the strengths and weaknesses of different types of social networks. She argues that most of us have a natural style of networking: we favor tight social circles, or brokering across varied groups, or having an expansive list of contacts. But she says we can also tweak the way we build relationships to meet our changing needs. For example, widening our outreach to boost creativity and innovation or focusing on trusted friends and colleagues to increase trust and happiness. King is the author of the book "Social Chemistry: Decoding the Patterns of Human Connection.”